<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>auto_focus</title>
    <script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
</head>
<body>
    <div id="app">
        <input v-focus>
    </div>
    <script>
        // Vue.directive('focus', {
        //     inserted: function(el){
        //         el.focus();
        //     }
        // });

        new Vue({
            el: '#app',
            directives: {
                focus: {
                    inserted: function(el){
                        el.focus();
                    }
                }
            }
        });
    </script>
</body>
</html>
